Set of bristles



FIG. 1 is a top, front, right side perspective view of a toothbrush bristle pattern showing our new design;

FIG. 2 is a left side elevational view thereof, the right side elevational view being a mirror image thereof;

FIG. 3 is a plan view thereof; and,

FIG. 4 is a bottom end view thereof.

The broken lines showing bristles and a toothbrush head and handle unit illustrate portions of the set and environmental structure that form no part of the claimed design. 

The ornamental design for a set of bristles, as shown and described. 